have you talked to the mom respectfully directly? she probably doesn’t know the severity of how her kids act because i’m willing to bet the landlord sent a generic “your neighbors say there is noise coming from your apartment please correct this or blah blah blah”

from experience, and in my opinion the worst thing you can do is call the police. depending on your town, they’re most likely not trained on how to handle children on the spectrum and could create a life threatening situation for the child(ren).

DCYF can’t do much as there is no law in the state that says children need to be a certain age before being left unattended. they may do a site visit to make sure they’re not neglected but that is really it.

if you can, plan a move or see if the landlord has another rental that will be available soon and try to come to an agreement. yes this sucks but this isn’t a police issue, or a DCYF issue it is a landlord-tenant issue and they need to come to a resolution with the mom.